Improvement in the manufacture of steel plates



UNITED STATE OGDEN BOLTON, JR., OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN THE. MANUFACTURE OF STEEL PLATES.

Specification forming part of Letters Patent No. 140.762, dated July l5,1873; application filed March 7, 1873.

To all whom it may concern:

Be it lknown that I, OGDEN BoLroN, J r., of Pittsburg, county ofAllegheny, and State of Pennsylvania, have invented certain new anduseful Improvements in the Manufacture of Steel Plates or Sheets, ofwhich the following is a specification:

The nature of my invention relates to the manufacture of steel ;andconsists in running the metal from a steel-melting furnace or Bessemerconverter into molds so that the ingot or in gots formed have a recessor recesses cast in them; and in the manufacture of mild steel platessuch as are usually employed for boiler plateif the ingots are castwithout recesses, cutting the ingot into any suitable size, and reducingthe pieces to plates or sheets, as will be more fully set forthhereafter.

The accompanying drawings show plan views of ingots cast with recesses.

In the manufacture of steel by the Bessemer converter or steel-meltingfurnaces the steel is either cast in single ingots or in groups. Incasting several single ingots the difficulties are various-the steel mayclog in the nozzle, causing a skull in the ladle, or the Stoppers mayburn or break, causing a Waste of steel. In casting groups of ingots,the connection between the center and other ingots, called sprues, arewaste, as also a portion or all of the center ingot.

To obviate these diicultiesI cast a heat from either a steel-meltingfurnace or Bessemer converter into one or more ingots, a, havingrecesses B formed in them. These recesses are formed by correspondingprojections in the mold or molds. Where one mold only is used for theWhole heat the steel may be run direct from the furnace or converter.These ingots can then be broken up or cut, bymeans of circular sawsorother suitable instruments, into pieces.

In the manufacture of soft steel, such as is used for boiler-plate, theadvantage of run' ning the whole heat from a Bessemer convert er ormelting-furnace into one or only a few in gots is greater than in highergrades of steel. The steel is then run into a mold or molds, and theingots may have a recess or recesses cast in them, and then, by means offalling Weights, circular saws, or other suitable instruments, may bedivided into pieces, or the ingots vmay have the recesses formed in themafter being cast and then be divided.

Where the ingots are cast double or more than double the size requiredfor a plate the in gots may be first partially rolled, then cut, andplaced in the furnace again, and finished in the ordinary Way. l

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The method described of casting an in got of steel with a recess orrecesses, substantially as set forth. e

2. The method described of manufacturing soft-steel plates,substantially as specified.

In testimony' that I claim the foregoing as my invention I affix mysignature this 17th day of February, 1873.

OGDEN BOLTON, JR.

Witnesses:

JOHN S. HoLLINesHEAD, HARVEY LIsT. Y

